Liu Chen, Felts Ashley C, Thuijs Annaliese E, Useche Aaron, Abboud Khalil A
Department of Chemistry and Environmental Science, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL, A2H 5G4, Canada.
Department of Chemistry, University of Florida, Gainesville, FL, 32611-7200, USA.
Acta Crystallogr E Crystallogr Commun. 2016 Jan 13;72(Pt 2):151-4. doi: 10.1107/S2056989016000220. eCollection 2016 Feb 1.
The central structural motif of the title coordination polymer, [Co(NO3)2(C4H4N2)(CH3CN)2(H2O)2] n , is a chain composed of Co(II) ions linked by bis-monodentate bridging pyrazine ligands through their N atoms. The Co(II) ion is located on an inversion center and is additionally coordinated by two O atoms of water mol-ecules and two N atoms of aceto-nitrile mol-ecules. The resultant N4O2 coordination sphere is distorted octa-hedral. The linear cationic chains extend parallel to the a axis and are aligned into layers parallel to the ac plane. Nitrate anions are situated in the space between the Co(II) chains and form O-H⋯O hydrogen bonds with the coordinating water mol-ecules, leading to a three-dimensional network structure. Weak C-H⋯O hydrogen bonds are also present between pyrazine or aceto-nitrile mol-ecules and the nitrate anions.
标题配位聚合物[Co(NO₃)₂(C₄H₄N₂)(CH₃CN)₂(H₂O)₂]ₙ的中心结构单元是一条由Co(II)离子构成的链，双单齿桥连吡嗪配体通过其N原子将Co(II)离子连接起来。Co(II)离子位于一个对称中心上，此外还与水分子的两个O原子和乙腈分子的两个N原子配位。由此形成的N₄O₂配位球呈畸变八面体构型。线性阳离子链平行于a轴延伸，并排列成平行于ac平面的层状结构。硝酸根阴离子位于Co(II)链之间的空间中，并与配位水分子形成O—H⋯O氢键，从而形成三维网络结构。吡嗪或乙腈分子与硝酸根阴离子之间也存在弱C—H⋯O氢键。
